9. Nu­mer­i­cal Pro­ce­dures

Since an­a­lyt­i­cal so­lu­tions in quan­tum me­chan­ics are ex­tremely lim­ited,
nu­mer­i­cal so­lu­tion is es­sen­tial. This chap­ter out­lines some of the
most im­por­tant ideas. The most glar­ing omis­sion at this time is the
DFT (Den­sity Func­tional The­ory.) A writer needs a sab­bat­i­cal.